diff --git a/build.gradle.kts b/build.gradle.kts
index 2e0eac6..b60e66a 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -8,7 +8,7 @@ plugins {
 val serialization_version = "1.3.4"
 
 group = "net.sergeych"
-version = "0.0.4"
+version = "0.0.6-SNAPSHOT"
 
 repositories {
     mavenCentral()
@@ -61,6 +61,7 @@ kotlin {
     sourceSets {
         all {
             languageSettings.optIn("kotlinx.serialization.ExperimentalSerializationApi")
+            languageSettings.optIn("kotlin.ExperimentalUnsignedTypes")
         }
         val commonMain by getting {
             dependencies {
diff --git a/src/commonMain/kotlin/net.sergeych.bintools/CRC.kt b/src/commonMain/kotlin/net.sergeych.bintools/CRC.kt
index 5b5a16e..85f4547 100644
--- a/src/commonMain/kotlin/net.sergeych.bintools/CRC.kt
+++ b/src/commonMain/kotlin/net.sergeych.bintools/CRC.kt
@@ -27,6 +27,9 @@ interface CRC<T> {
         fun crc8(data: ByteArray, polynomial: UByte = 0xA7.toUByte()): UByte =
             CRC8(polynomial).also { it.update(data) }.value
 
+        fun crc8(data: UByteArray, polynomial: UByte = 0xA7.toUByte()): UByte =
+            CRC8(polynomial).also { it.update(data) }.value
+
         /**
          * Calculate CRC16 for a data array using a given polynomial (CRC16-CCITT polynomial (0x1021) by default)
          */
@@ -45,6 +48,7 @@ infix fun UShort.shl(bitCount: Int): UShort = (this.toUInt() shl bitCount).toUSh
 infix fun UShort.shr(bitCount: Int): UShort = (this.toUInt() shr bitCount).toUShort()
 
 infix fun UByte.shl(bitCount: Int): UByte = (this.toUInt() shl bitCount).toUByte()
+@Suppress("unused")
 infix fun UByte.shr(bitCount: Int): UByte = (this.toUInt() shr bitCount).toUByte()
 
 fun UByte.toBigEndianUShort(): UShort = this.toUShort() shl 8
diff --git a/src/commonMain/kotlin/net.sergeych.bintools/DataSource.kt b/src/commonMain/kotlin/net.sergeych.bintools/DataSource.kt
index f5072fd..a786635 100644
--- a/src/commonMain/kotlin/net.sergeych.bintools/DataSource.kt
+++ b/src/commonMain/kotlin/net.sergeych.bintools/DataSource.kt
@@ -6,6 +6,7 @@ package net.sergeych.bintools
  * like multiplatform version of DataInput
  *
  */
+@Suppress("unused")
 interface DataSource {
 
     /**
@@ -33,7 +34,7 @@ interface DataSource {
 
     fun readDouble() = Double.fromBits(readI64())
 
-    fun readFloat() = Float.fromBits(readI32()).toFloat()
+    fun readFloat() = Float.fromBits(readI32())
 
     fun readSmartUInt(): UInt = Smartint.decodeUnsigned(this).toUInt()
     fun readSmartInt(): Int = Smartint.decodeSigned(this).toInt()
@@ -44,7 +45,6 @@ interface DataSource {
 
 
 }
-
 fun ByteArray.toDataSource(): DataSource =
     object : DataSource {
         var position = 0
@@ -59,5 +59,19 @@ fun ByteArray.toDataSource(): DataSource =
         }
     }
 
+fun UByteArray.toDataSource(): DataSource =
+    object : DataSource {
+        var position = 0
+            private set
+
+        override fun readByte(): Byte =
+            if (position < size) this@toDataSource[position++].toByte()
+            else throw DataSource.EndOfData()
+
+        override fun toString(): String {
+            return "ASrc[$position]: ${encodeToHex()}"
+        }
+    }
+
 inline fun <reified T : Any> DataSource.readNumber(): T = Smartint.decode(this) as T
 
diff --git a/src/commonMain/kotlin/net.sergeych.bintools/MotherPack.kt b/src/commonMain/kotlin/net.sergeych.bintools/MotherPack.kt
index 4b463a6..16f4a0e 100644
--- a/src/commonMain/kotlin/net.sergeych.bintools/MotherPack.kt
+++ b/src/commonMain/kotlin/net.sergeych.bintools/MotherPack.kt
@@ -24,6 +24,7 @@ class JsonPacker : MotherPacker {
         return Json.encodeToString(serializer(type), payload).encodeToByteArray()
     }
 
+    @Suppress("UNCHECKED_CAST")
     override fun <T> unpack(type: KType, packed: ByteArray): T {
         return Json.decodeFromString<T>(
             serializer(type) as KSerializer<T>,
diff --git a/src/commonMain/kotlin/net.sergeych.bintools/simple_codecs.kt b/src/commonMain/kotlin/net.sergeych.bintools/simple_codecs.kt
index e7c076a..02b78fc 100644
--- a/src/commonMain/kotlin/net.sergeych.bintools/simple_codecs.kt
+++ b/src/commonMain/kotlin/net.sergeych.bintools/simple_codecs.kt
@@ -106,6 +106,7 @@ fun UByte.encodeToHex(length: Int = 0) = toLong().encodeToHex(length)
 fun ULong.encodeToHex(length: Int = 0) = toLong().encodeToHex(length)
 
 fun ByteArray.encodeToHex(separator: String = " "): String = joinToString(separator) { it.toUByte().encodeToHex(2) }
+fun UByteArray.encodeToHex(separator: String = " "): String = joinToString(separator) { it.encodeToHex(2) }
 
 @Suppress("unused")
 fun Collection<Byte>.encodeToHex(separator: String = " "): String = joinToString(separator) { it.toUByte().encodeToHex(2) }
diff --git a/src/commonMain/kotlin/net.sergeych.bipack/MotherBipack.kt b/src/commonMain/kotlin/net.sergeych.bipack/MotherBipack.kt
index 3714699..0d4d863 100644
--- a/src/commonMain/kotlin/net.sergeych.bipack/MotherBipack.kt
+++ b/src/commonMain/kotlin/net.sergeych.bipack/MotherBipack.kt
@@ -6,11 +6,13 @@ import net.sergeych.bintools.MotherPacker
 import net.sergeych.bintools.toDataSource
 import kotlin.reflect.KType
 
+@Suppress("unused")
 class MotherBipack : MotherPacker {
     override fun <T> pack(type: KType, payload: T): ByteArray {
         return BipackEncoder.encode(serializer(type), payload)
     }
 
+    @Suppress("UNCHECKED_CAST")
     override fun <T> unpack(type: KType, packed: ByteArray): T {
         return BipackDecoder.decode<T>(packed.toDataSource(),
             serializer(type) as KSerializer<T>)
diff --git a/src/commonTest/kotlin/bintools/CrcTest.kt b/src/commonTest/kotlin/bintools/CrcTest.kt
new file mode 100644
index 0000000..a626ad6
--- /dev/null
+++ b/src/commonTest/kotlin/bintools/CrcTest.kt
@@ -0,0 +1,16 @@
+package bintools
+
+import net.sergeych.bintools.CRC
+import net.sergeych.bintools.encodeToHex
+import kotlin.test.Test
+
+class CrcTest {
+    @Test
+    fun testVectors() {
+        val x = byteArrayOf(1,2,3,4,5)
+        val crc = CRC.crc8(x)
+        println("->> ${x.toList()}")
+        println("->> ${crc.encodeToHex()}")
+        println("->> ${crc}")
+    }
+}
\ No newline at end of file